Loud-speaker



LOUD SPEAKER Sept. 7,10', 1929.

Filed May l. 1924 lullllnllrl' UNITED STATES PATENTl oFFlcE.

ARTHUR ATWATER KENT, OF ARDMORE, PENNSYLVANIA.

LOUD-SPEAKER.

Application led Hay 1, 1924. Serial No. 710,240.

My invention relates to loud speakers, such as telephones provided withamplifying horns, utilizable in radio receiving apparatus and otherrelations.

In accordance with my invention, the instrument comprises a 4telephonehousing which serves to join the instrument base, preferably of sheetmetal, with the horn structure, which latter preferably comprises 'asection of cast metal and a bell of sheet material, preferably metal,joined to the cast metal section.

l More particularly in accordance with' my invention, the telephonehousing is provided with external iange or lug structure, preferablyintermediate the ends of the housing, to which the base is secured; andthe telephone housing is provided with a neck havmg a sound passageregistering with the sound passage of the cast metal section of thehorn, which is separate and distinct from the base and joins the neckofthe telephone hous- 1n urther in accordance with my invention, thecast section of the horn terminates at its lar e end in a flange towhich the bell is attac ed, 'preferably by an inwardly extending flangeregistering with the iange upon the cast metal section.

My invention resides in structure' of the character hereinafterdescribed and claimed.

For an illustration of one of the various forms my invention may take,reference is to he had to the accompanying drawing, in which:

Fig. l is a side elevational view, .partly in section, of a loud speakerembodying my invention.

Fig. 2 is a fragmentary vertical sectional view, on enlarged scale, oithe base, telephone housing and lower portion of the horn section. 4

Fig. 3 is a fragmentaryhorizontal sectional view, partly in plan, takenon the line 3-3 of F1 2.

Re erring to the drawing,His the telephone housing, referaoly of castmetal, as a die casting, c osed at one end by the member l,

passage 4 in the horn section S, preferably off cast metal, and/providedat its lower end with the integral sleeve 5 which receives the neck 2,whereby the horn as a Whole is supported directly and rotatable upon thetelephone housing H.

At its end opposite to the end closure 1 the housing H is open, andinteriorly threaded to receive the exteriorly threaded cap C, or secondhousing member, preferably of molded insulating material, within whichis carried the telephone magnet system comprising the permanent magnet Mhaving the pole pieces 6, 6, upon which are disposed the magnet coils 7,7, whose terminals connect with the binding posts 8, 8, with whichconnect the terminals 9, 9 of the flexible telephone cord 10 extendingthrough the central aperture 11 in the cap C. Disposed in the upper endof the housing H is the telephone diaphragm T, controlled by the magnetsystem, and held between the resilient washers 12, 12 confined by themetal ring or washer 13 pressed upwardly by the undulating spring 14engaging the upper or inner end of the cap C, which latter b rotationwith respect to the housing H a vances or recedes, thereby adjusting thepoles 6 with respect to the diaphragm'T and adj usting the pressureexerted by the spring 14 upon the outer margin of the diaphragm T.

The telephone structure utilized may be of any suitable type orcharacter, and the structure above described is merely an-example of oneof various forms which may be utilized.

Upon the exterior of the housing H, preferably between its upper andlower ends, is the outwardly extending lug structure or ilange 15 havingthe ears 16, into which are threaded the screws 17 extending throughholes in the upper' inwardly extending liange 18 the hollow orbell-shaped base D, cheaply and simply formed ci sheet metal andpreierably having at its lower end the bead or roll 19, at which itrests upon a table or other support. At 20 the base D is provided withan aperture through which the telephone cord 10 extends iromthe interiorof the cap C to the binding posts oia the circuit which supplies thesoundor s eeclxrepresenting current.

it 'the and large end of the horn section S it is provided withcircumferentially spaced lugs or the circumferentially contlnuous flange21, preferably inclined to.

the vertical, asv indicated in Fig. 1. The bell or second section B ofthe horn structure is constructed of sheet material, preferably metal,flaring from -its small to its largel end or mouth, where it is providedwith'the roll or bead 22. At its small end the bell B has the inwardlyturned lugs or circumferentially continuous flange 23 abutting a ainstthe lugs or flange 21 of the cast section Screws or equivalent means 24secure the two sections S and B to each other at their abutting lugs orflanges. As indicated, the screws 24 are preferably threaded through thelugs or flange 23 from the interior of the bell B into the lugs orflange 21 ofthe section S.

A horn comprising the sections S and B, of

the character and structure described, is sim-v ple, of low cost ofmanufacture, and yet fully effective for amplifying with small, if any,distortion the sound waves produced by the telephone diaphragm T.

By the combination of the character described there may be utilized forthe base D sheet metal, as distinguished from more substantial castmetal bases, effecting substantial saving incest, without sacrificingeffectiveness. Thi's is made possible by utilizing the.

telephone housingljl as a connecting member between the base and thehorn structure proper.

.As indicated in the drawing, it is preferred that the base D 'besecured to the under side ofthe flange or lug structure upon the housingH, though it will be understood that the flange 18 of the base D may bedisposed. above the flange or lug structure l5.

In the appended claims, when it is specified that an end of a horn orbell section comprises or terminates in flange structure, it shall beunderstood that such term comprehends or includes flanges, ribs or thelike. What I claim is:

1. Ahorn for amplifying sound waves comprising a horn section of castmetal, outwardly extending flange structure at its larger end, a bellsection of sheet metal, inwardly extending flange structure at itssmaller end, said flange structures abutting each other in detachablerelation, and means for clamping the flange structures of said sectionsto each other.

2. A horn for amplifying sound waves comprising a ooseneck horn sectionof cast metal, external ange structure at its larger end, a bell sectionof sheet metal, inwardly extending flange structure at its smaller end,said flange structures abutting each other in detachable relation, andmeans forl clamping the flange structures of said sections to eachother.

ARTHUR ATWATER KENT.

